And now the countdown to thanks. Aaa says a whopping 43.6 million americans will travel 50 miles or more. The vast majority 90% will be driving and from weather to gridlock to gas american families are in for quite a trip. Here's abc's alex perez. Reporter: This woman is a travel pro. She and the kids are making the drive to see loved ones in indiana today to avoid the mayhem of motorists later this week. It's going to get crazy. Try to get off in the rest areas. It's just people everywhere. Reporter: They joined some 39 million others who will be clogging roadways this thanksgiving holiday and as the stress on the roads begin some relief at the pump. Gas prices down 5 cents in the last two weeks. But thanksgiving carves out a week of worries on roadways and with all of these families getting in their cars, the number of ins dentsds will skyrocket this week so here are a few things you should lookut for. Like traveling on unfamiliar roadways, not knowing the lay of the land could be disastrous. Plan your route ahead of time so you're not fumbling with the gps or directions or figuring out where you're trying to go and leave the navigation if possible to a passenger. Reporter: Be mindful of the clock, 5 to 7 p.M. Begins high risk hour. 20% more fatal crashes during those hours during that week than other weeks. Keep your eyes for headlights. Experts say the best way to anufr the roads this week is just like fixing a thanksgiving feast, slowly and with lots of prep work. Alex perez, abc news, chicago.

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